DOW-UAP-D126: Advanced Nuclear Propulsion for Manned Deep Space Missions - Pure-Deuterium Fusion Charges, a Magnetic Mirror and a 1.5-km "Super Marx" Generator

Source file: DOW-UAP-D126_AAWSAP-DIRD-Advanced-Nuclear-Propulsion-for-Manned-Deep-Space-Missions-March-11-2010.pdf Originating agency: Defense Intelligence Agency (DIA), Defense Warning Office, under the AAWSAP program Document type: Defense Intelligence Reference Document (DIRD), "Acquisition Threat Support" series; control number DIA-08-1003-007 Date: 11 March 2010 (information cutoff date, ICOD: 1 December 2009) Classification: UNCLASSIFIED//FOR OFFICIAL USE ONLY (the FOUO marking is struck through on every page; released to the public in 2026) Page count: 37 VIRIN: 260918-D-D0360-1115 PURSUE Release: 6

Summary

"Advanced Nuclear Propulsion for Manned Deep Space Missions" runs to 31 numbered pages plus front matter, with 17 figures, 2 tables, 42 numbered equations and one appendix. It was prepared by the Acquisition Support Division (DWO-3) of DIA's Defense Warning Office, and the author's name is redacted as AAP Person 72.

This is a distinctly mathematical paper: most of it consists of order-of-magnitude calculations in plasma and fusion physics, in cgs units. It also explicitly distances itself from the idea that a propulsion breakthrough will come from new laws of physics, an idea that other papers in the series, such as DOW-UAP-D138 on warp drive and dark energy, explore. In the author's words, it is "quite possible that all the fundamental laws of physics relevant to propulsion have been discovered," and the question is whether they suffice.

The central claim: crewed flight beyond the Moon needs both high thrust and high specific impulse, and the only known concept that delivers both is propulsion by nuclear explosions, in the spirit of Project Orion. To avoid fallout and the waste inherent in small fission bombs, the author proposes tiny fusion bombs of pure deuterium, a fuel that can be extracted from water on comets, asteroids and planets. The paper does not mention UFOs or unidentified phenomena; the phrase "extraterrestrial bodies" appears only as a description of the celestial bodies where the spacecraft would refuel.

Research Article

The document and its personal preface

The cover carries the date 11 March 2010, the information cutoff date of 1 December 2009 and the control number DIA-08-1003-007 (page 1). The administrative note on page 2 states that the paper is "one in a series of advanced technology reports produced in FY 2009" under the AAWSA Program, and that questions are to be addressed to AAP Person 1, the program manager, at DIA in Washington.

The preface (pages 5 to 6) is written in the first person, which is unusual in the series. The author describes an interest in spaceflight from the age of ten, a physics education in Germany, and work since 1954 on the nonfission ignition of thermonuclear reactions by inertial confinement. After coming to the United States, according to the preface, the author met Ted Taylor and Freeman Dyson in San Diego while they were working on Project Orion, but could not join their group because the work was classified and the author was not yet a U.S. citizen. The preface adds a historical claim for which the paper offers no documentation: from "conversations" with Heisenberg the author knows that an idea similar to Orion was presented to Heisenberg by Wernher von Braun in Berlin "in or around 1942."

The preface closes with an exchange from George Dyson's book on Orion: Ted Taylor believed small, clean, fission-free bombs could be built but feared they "would be irresistible as weapons"; Freeman Dyson thought Taylor was wrong. The author writes: "I for my part think Freeman is wrong." The author also quotes Taylor, who shortly before his death described a dream "about a new form of nuclear weapon," and guesses that it concerned chemical "superexplosives" able to ignite a thermonuclear bomb, the subject of the appendix.

Of the 12 technical areas defined in the program's Statement of Objectives (DOW-UAP-D110), the paper mainly serves propulsion, and to a lesser degree power generation, since it argues that the same principles would lead to "clean nuclear energy." It proposes no weapons, but the preface raises the military dimension explicitly: a pure fusion bomb is also a proliferation problem.

Four "proofs" and a target at 550 astronomical units

The introduction (page 7) opens with a comparison to Hermann Oberth's 1923 book on chemical rockets and promises to "prove" four propositions: that at the present state of science and technology one can build spaceships driven by deuterium fusion reactions able to reach the outer limits of the solar system; that such ships allow crewed exploration of the entire solar system and beyond; that development costs will be high but "well within what is economically feasible"; and that the same principles will lead to clean nuclear energy. The paper gives no cost estimate or timeline of any kind.

The first destination is the focus of the "Einstein gravitational lens" at 550 astronomical units, where the Sun can be used as the lens of a super telescope, an idea the paper credits to Claudio Maccone in 1993. The long-range vision is to "build bridges" through the Oort cloud, a source of ice and deuterium, and eventually reach Earthlike planets in neighboring systems. In the conclusion the author is more modest: deuterium propulsion would make crewed flight to the Oort cloud possible, "at a distance at about one-tenth of one light year."

Why deuterium, and why without fission

The physics at the base of the paper is well known. In the deuterium-tritium (DT) reaction, the easiest to ignite, 80 percent of the energy is released as neutrons, which no magnetic mirror can deflect. The deuterium-helium-3 reaction produces mainly charged particles, but helium-3 is scarcely available; the British Interplanetary Society's Project Daedalus proposed to "mine" it from Jupiter's atmosphere. In pure deuterium, once secondary reactions are counted, 62 percent of the energy goes into charged products and 38 percent into neutrons (page 11). The maximum exhaust velocity from Table 1 is 1.5x10^9 cm per second, and in the best case, with neutron entrapment, 1.9x10^9 cm per second, or 6.3 percent of the speed of light (page 26). For general comparison, chemical rocket engines reach exhaust velocities of about 4.5 km per second.

The problem is ignition. According to the paper, the condition for propagating burn in DT requires about one megajoule, while a sphere of deuterium would need 10,000 times more, about 10^4 megajoules, "for all practical purposes out of reach" without a fission bomb (page 14). Figure 1, "Solution in between two extremes," places the proposal between two poles: the Centurion-Halite experiment at the Nevada Test Site, in which a DT pellet was ignited by X-rays from an underground fission explosion, and the 15-megaton "Mike" test, in which liquid deuterium was ignited in the Teller-Ulam configuration (page 17). The proposed solution: a thin rod of deuterium ignited at one end by a 10^7-ampere GeV proton beam. The beam's own magnetic field traps the charged products inside the rod, the spherical condition is replaced by a condition along the rod, and the ignition energy falls to around one gigajoule. Table 2 shows that all the products are trapped above a critical current of 3.84x10^6 amperes (pages 13 to 15).

The spacecraft as a capacitor: gigavolts and a magnetic mirror

The central innovation is that the spacecraft itself serves as a giant capacitor. In the vacuum of space, the author argues, a conducting body can be charged to gigavolt potentials if a strong magnetic field runs parallel to its surface ("magnetic insulation"). A spacecraft about 30 meters across, in a field of 10^4 gauss, would charge to 3x10^9 volts and store about a gigajoule, released within 10^-7 seconds at a power of 30 petawatts (page 22). Figure 4 shows the "superconducting atomic spaceship": azimuthal currents around the hull insulate it and also create a magnetic mirror that reflects the plasma fireball, replacing Orion's pusher plate. To guide the beam to the bomb, a miniature hydrogen-filled rocket chamber attached to the target fires a plasma jet toward the spacecraft, forming a conducting "bridge" (page 21).

The order-of-magnitude estimate on pages 18 to 19 shows the scale. A 1,000-ton spacecraft accelerating at one g needs power equivalent to "about one nuclear kiloton bomb per second." To reach 100 km per second, "the velocity needed for fast interplanetary travel," about 10^4 one-kiloton fusion bombs are needed, with a total mass of about 100 tons. The author concludes that "a very large number of nuclear explosions are needed," so only a cheap and abundant fuel such as deuterium makes sense. The 38 percent of energy carried by neutrons calls for a large radiator; the author proposes a boron diaphragm and a hydrogen moderator (Figure 3), and assumes that boron "very likely" exists in comets. A further proposal is an "autocatalytic detonation wave," in which soft X-rays compress the fuel ahead of the front and trap the neutrons.

Launch from Earth and a ground test

The author concedes that "to lift large payloads into Earth orbit remains the most difficult task": in the atmosphere, magnetic insulation fails. For ground launch the paper proposes an ultraviolet argon laser pumped by a converging shock wave from a shell of high explosive (hexogen), heating an argon rod to 90,000 Kelvin and producing megajoule pulses, to ignite a small DT explosion that in turn ignites a larger deuterium explosion in a "mini-Teller-Ulam" configuration (Figure 5, pages 22 to 23). The author reports first proposing this in a classified report of January 1970, declassified in July 2007, while a Los Alamos group proposed carbon dioxide lasers in November 1970, whose wavelength the author considers too long. Reaching 10 km per second at 10 percent efficiency would take about 100 one-kiloton explosions (page 24). The paper does not discuss the environmental or legal implications of nuclear explosions in the atmosphere, beyond stating that such explosions would produce no radioactive fallout.

To test the concept without a spacecraft, the author proposes a "Super Marx generator": a two-stage Marx generator in which about 100 coaxial capacitors, each 15 meters long and charged to 10 megavolts, are switched in series to 1 gigavolt inside a 1.5-km vacuum tunnel (Figures 7 to 13, pages 26 to 31). The text also speaks of a "mile-long" generator, a small inconsistency between caption and text. An alternative, which the paper attributes to a private communication from one Fuelling, uses water capacitors and transformer-oil insulation.

The appendix: conjectured "superexplosives"

The appendix (pages 32 to 35) is the most speculative part, and the author explicitly labels it "conjectured." The idea: under pressures of about 100 megabars, the inner electron shells of neighboring atoms might form "bridges," and on breaking up release a burst of keV X-rays, much as a chemical explosive releases eV photons. A rough calculation for neon gives about 15 keV. Such pressures, the paper says, can be reached by beam bombardment, by hypervelocity impact at 30 km per second, or with a converging shock wave. The paper offers no experimental evidence that such materials exist, and presents them only as a "more speculative possibility" (page 8).

Significance

The paper completes the other side of the propulsion discussion in the AAWSAP library. Compared with DOW-UAP-D123 on positrons, which rests on antimatter, this paper mentions antimatter only briefly: ignition with nanogram amounts of antimatter "appears to have credible potential," but even then its production and storage "pose serious technical problems"; and compared with DOW-UAP-D124 on launch infrastructure, it leaps ahead to the Oort cloud. It presents a coherent physical argument, with explicit calculations, about an energy source whose existence is proven (deuterium fusion in hydrogen bombs), but the entire proposed ignition chain, from a 10-million-ampere proton beam to a gigavolt generator one and a half kilometers long, has not been built.

Some general context helps in reading it. The author wrote in 2010 that no DT microexplosions had "yet" been ignited; in December 2022 the U.S. National Ignition Facility (NIF) announced the first laser ignition of a DT target with a fusion yield exceeding the laser energy delivered, but ignition of pure deuterium, the heart of the proposal, has not been demonstrated. In addition, the 1963 Partial Test Ban Treaty prohibits nuclear explosions in the atmosphere and in outer space, an issue the paper does not mention at all.

Finally, as to unidentified phenomena: the paper contains nothing of the kind. It does not deal with UFOs, attributes no capabilities to any foreign actor and analyzes no threat. Its value to the archive lies in documenting a line of thought rooted in Project Orion and in the inertial-fusion research of the 1960s and 1970s, as presented to an intelligence program in 2010, together with historical anecdotes about Taylor, Dyson and Heisenberg.

Key People

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Key Concepts

Notable Quotes

"We have little reason to expect that new fundamental laws of physics that could lead to a breakthrough in propulsion still await discovery." -- page 6

"I had a dream last night, about a new form of nuclear weapon, and I am really scared of it." -- page 6, Ted Taylor as quoted in the paper

"At the present state of science and technology one can build spaceships driven by deuterium thermonuclear reactions, able to reach the outer limits of the solar system." -- page 7

"For manned space flight beyond the Moon, nuclear propulsion is indispensable." -- page 16

"One can summarize these estimates by concluding that a very large number of nuclear explosions are needed, which for fission explosions, as well as for deuterium-tritium explosions, would become very expensive." -- page 19

"With no deuterium-tritium (DT) microexplosions yet ignited, the nonfission ignition of pure deuterium (DD) fusion explosions seems to be a tall order." -- page 19

"If large-scale manned spaceflight has any future, a high-specific-impulse, high-thrust propulsion system is needed. The only known propulsion concept with this property is nuclear bomb propulsion." -- page 31